[vectorIntrinsics] RFR: 8254826: Add reduction nodes implementation for Arm SVE

[Ningsheng Jian]

On Fri, 16 Oct 2020 16:14:44 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> @nsjian my sense is such enhancements are more appropriate in the panama-vector repository until the SVE implementation
> is mature enough to your and other's satisfaction. In combination, perhaps there are API changes that are useful in
> this regard. We have the opportunity to think a little more holistically, and AFAICT we have some luxury of time given
> SVE is still in the early phases of production hardware compared to the other platforms.  Further, ramp down phase 1 of
> JDK 16 is not that far away. Focusing on the quality of the x86 and AArch64 Neon in the mainline does seem a higher
> priority to me.  We will re-incubate the Vector API every release if there are changes, a new JEP with updated
> contents. When SVE support is ready we could update the JEP contents to place it on the same level as x86 and AArch64
> Neon.  Does that sound reasonable?

@PaulSandoz Yes, that sounds good to me.

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PR: https://git.openjdk.java.net/panama-vector/pull/13